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What is the role of natural selection in evolution?
Weegy: Natural selection's role in the evolution of species is like the role of the pruning shears in the shaping of topiary animals. [ The bush grows out all over just as mutations occur for all kinds of different variation among the individuals of the species. The pruning shears clip out those portions of the bush that don't fit into the shape of the animal, just as natural selection clips out those mutations that are poorly adapted to the environment. The parts of the bush that aren't clipped continue to grow so as to fill out the shape of the animal. Similarly, those mutations that aren't clipped increase their representation in the population, and thereby combine and build on each other to increase the adaptation of the population to the environment and to its ecological niche. ] (More)
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Asked 6/12/2013 9:24:16 AM
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Lyell's theory that geological processes occurred over time led Darwin to formulate which of these concepts?
Weegy: Lyell documented the fact that the earth must be extremely old, and that throughout time, the planet has continually undergone processes that change and shape the land, including erosion, earthquakes, glacial movements, volcanoes, [ and even the decomposition of dead plants and animals. ] (More)
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Asked 6/12/2013 9:32:49 AM
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A population of mice has black or brown hair. The gene for black hair color (B) is dominant over brown (b). If 16% of the mice are homozygous black and 24% are heterozygous black, what would be the frequency of each allele? (p + q = 1, p2 + 2pq + q2 = 1)
Weegy: In this question you're assuming Hardy-Weinberg equilibrium. In other words, if B and b are the two alleles, B + b = 1 and B^2 + 2Bb + b^2 = 1. If 16% of mice are homozygous black, B^2 = 0.16, meaning B = 0.4 and b = 1 - 0.4 = 0.6. Answer is C. [ Notice how you don't even need to know that 24% of the mice are heterozygous. ] (More)
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Asked 6/12/2013 9:43:39 AM
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castle hardy weinburg
Weegy: The Hardy–Weinberg principle (also known as the Hardy–Weinberg equilibrium, model, theorem, [ or law) states that allele and genotype frequencies in a population will remain constant from generation to generation in the absence of other evolutionary influences. These influences include non-random mating, mutation, selection, genetic drift, gene flow and meiotic drive. Because one or more of these influences are typically present in real populations, the Hardy–Weinberg principle describes an ideal condition against which the effects of these influences can be analyzed. ] (More)
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Asked 6/12/2013 10:17:57 AM
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A new and effective antibiotic becomes widely used for a particular species of bacteria. After some time, an antibiotic-resistant strain of the bacteria becomes prevalent. Which mechanism explains this phenomenon?
Weegy: It is resistance mechanism. (A new and effective antibiotic becomes widely used for a particular species of bacteria. After some time, an antibiotic-resistant strain of the bacteria becomes prevalent.) (More)
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Asked 6/12/2013 11:37:54 AM
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